Quantum control of a nanoparticle optically levitated in cryogenic free space

Tebbenjohanns, Felix; Mattana, M. Luisa; Rossi, Massimiliano; Frimmer, Martin; Novotny, Lukas

doi:10.1038/s41586-021-03617-w

Cited by 245 publications

(172 citation statements)

References 71 publications

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“…However, for realistic magnetic fields, the oscillation period is too long to provide effective spin decoupling; therefore, we introduce a structure of magnetic teeth. The proposed scheme does not require the motion of the center of mass of the nanodiamond to be cooled to the quantum ground state [16,18,19], although motional ground-state cooling has been experimentally demonstrated for levitated nanoparticles [20][21][22]. Other key experiments in this area include nanodiamonds levitated with optical tweezers [23][24][25][26][27][28], Paul traps [29][30][31][32][33][34], and magnetic traps [35,36].…”

Section: Introductionmentioning

confidence: 99%

Spin dynamical decoupling for generating macroscopic superpositions of a free-falling nanodiamond

2022

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Levitated nanodiamonds containing negatively charged nitrogen-vacancy centers (NV − ) have been proposed as a platform to generate macroscopic spatial superpositions. Requirements for this include having a long NV − spin coherence time, which necessitates formulating a dynamical decoupling strategy in which the regular spin flips do not cancel the growth of the superposition through the Stern-Gerlach effect in an inhomogeneous magnetic field. Here, we propose a scheme to place a 250-nm-diameter diamond in a superposition with spatial separation of over 250 nm, while incorporating dynamical decoupling. We achieve this by letting a diamond fall for 2.4 m through a magnetic structure, including 1.13 m in an inhomogeneous region generated by magnetic teeth.

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Section: Introductionmentioning

confidence: 99%

Spin dynamical decoupling for generating macroscopic superpositions of a free-falling nanodiamond

2022

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“…Recently, the coherent scattering mechanism has been theoretically investigated to cool both the axial and the in-plane motion of the levitated optomechanical system via a cavity mode [24,25]. The axial motion of the optically levitated nano-particle has been cooled to the ground state, either through the coherent scattering induced cavity cooling [26,27], or through the feedback cooling [28,29]. Moreover, the strong coherent scattering coupling between the cavity field and the motion of the nano-particle has also been observed in experiment [30].…”

Section: Introductionmentioning

confidence: 99%

Squeezing Light via Levitated Cavity Optomechanics

Yin

2022

Photonics

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Squeezing light is a critical resource in both fundamental physics and precision measurement. Squeezing light has been generated through optical-parametric amplification inside an optical resonator. However, preparing the squeezing light in an optomechanical system is still a challenge for the thermal noise inevitably coupled to the system. We consider an optically levitated nano-particle in a bichromatic cavity, in which two cavity modes could be excited by the scattering photons of the dual tweezers, respectively. Based on the coherent scattering mechanism, the ultra-strong coupling between the cavity field and the torsional motion of nano-particle could be achieved for the current experimental conditions. With the back-action of the optically levitated nano-particle, the broad single-mode squeezing light can be realized in the bad cavity regime. Even at room temperature, the single-mode light can be squeezed for more than 17 dB, which is far beyond the 3 dB limit. The two-mode squeezing light can also be generated, if the optical tweezers contain two frequencies, one is on the red sideband of the cavity mode, the other is on the blue sideband. The two-mode squeezing can be maximized near the boundary of the system stable regime and is sensitive to both the cavity decay rate and the power of the optical tweezers.

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“…More recently, coherent scattering from an optically trapped nanoparticle into a cavity mode has achieved ground state cooling [22]. Active feedback cooling, based on measurements of the particle motion, has also been explored with several experiments reaching the ground state or low phonon occupancy [23][24][25][26]. Modulating the trapping potential at twice the particle frequency (parametric feedback) [27,28] or applying a linear force proportional to the particle's velocity (velocity damping) [29,30] are two techniques that have been used extensively.…”

Section: Introductionmentioning

confidence: 99%

Performance and limits of feedback cooling methods for levitated oscillators: A direct comparison

2021

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Cooling the center-of-mass motion is an important tool for levitated optomechanical systems, but it is often not clear which method can practically reach lower temperatures for a particular experiment. We directly compare the parametric and velocity feedback damping methods, which are used extensively for cooling the motion of single trapped particles in a range of traps. By performing experiments on the same particle, and with the same detection system, we demonstrate that velocity damping cools the oscillator to a temperature an order of magnitude lower and is more resilient to imperfect experimental conditions. We show that these results are consistent with analytical limits as well as numerical simulations that include experimental noise.

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Quantum control of a nanoparticle optically levitated in cryogenic free space

Cited by 245 publications

References 71 publications

Spin dynamical decoupling for generating macroscopic superpositions of a free-falling nanodiamond

Spin dynamical decoupling for generating macroscopic superpositions of a free-falling nanodiamond

Squeezing Light via Levitated Cavity Optomechanics

Performance and limits of feedback cooling methods for levitated oscillators: A direct comparison

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